Signor to geimme



1927. May H. HOFFMEISTER CALCULATING MACH-INF 2 Shoots-Sheet l Filed Oct. 20. 1924 2 Sh eets-Sheot 2 H. HOIFFMEISTER CALCULATING MACHINE Filed Oct. 20.4924

May 31 1927.

Patented May 31, 19376 nmrsn srArss HERMANN' l-IOFFIVIEISTER, GE GLIESMARODE, NEAR Blt-U'NSVIICK, GERMANY, AS-

PATENT QFFECE,

SIGNOR TO GRIMME, NATALZS 85 05);, AKTIENGESELLSGEAFT, O1? BRUNSWICK, GER- MANY, A CORPORATION -13 GERMAQIY.

CALCULATING MACHINE.

Application filed October 20, 1924, Serial No. 244,789, and in Germany October 27, 1923.

My invention relates to improvements in calculating: machines, and more particularly to means for shifting the carriage or slide which carries the settingor resisteriug;- mechanism which means comprises a lever mounted to rock within a horizontal. plane and. adapted. when rocked to the right or left, to unlock. the carriage and to throw a pawl into engagement with a stop member and thus ensures displacement of the carriagea distance corresponding to the dis tance of adjacent numeral wheels. The object 01 the improvements is to provide mechanism of this type by means of which the carriage may be shifted a distance corresponding to a plurality oi orders of the numeral wheels. without the necessity of a stop for the fingers, and without the pawls sliding; along the stops when shifting the carriage- Vith this object in view. the operating lever which carries the pawls for imparting step-by-step movement to the carriage is mounted so as to be shittable on its pivot bolt for throwingthe pawls into and out of position for engagement with the stops Two embodiments of the invention are shown in the accompanying: drawing in which the same reference characters are used in all the views to indicate corresponding: parts. In said drawing,

Fig. 1, is an elevation, partly in SCCtlOlL showing a calculating machine provided with my improved shitting mechanism.

Fig. 2,. is a detail view looking from the right in- Fig. 1 and showing the hand piece oii the operating lever and the slot termed in the front wall of the machine CElSlHP,

Fig. 8, is a bottom view on an enlarged scale showing; the operating mechanisnm F 1 is an elevation similar to Fig. 1 and showing a modification of the shifting mechanism, and

Fig. is a bottom view on an enlarged scale showing the shifting mechanism illustrated in Fig. 4:.

In the example shown in Figs. 1 to 3 the calculating machine comprises a. casing 25, the bottom plate 26 of which is provided with guide ways 27', 28 for the base plate 1 of the carriage 29. Between two pairs of pins 2, 2 and 3, 3 secured to the bottom side of the base plate 1 of the carriage a latch or slide 5 is guided of which slide a nose 6 is normally in looking engagement with a rack 7 provided on the bottom plate 26 of the machine casing. A spring lacting on the slide 5 tends to force the same rearwardly to bring the nose 6 into engagement with the rach 7. To the bottom side ol the base plate 1 of the carriage is secured a pin 9 which passes through a slot 8 of the slide 5 and a slot 16 formed in a T-shaped rockable operating lever 10 carrying at each of its ends a pawl 13 acted upon by a spring l2 and located between stops 1&- and 15 depending from the lever 10. The pawls .13. 13 are adapted to engage a rack provided on the bottom plate 26. On pins 17 secured to the bottom side of the base plate 1 two slide or latch-shifting levers 18 are rockingly mounted which bear on shoulders termed on the slide 5, and which are adapted to engage the stops 1-l depending from the lever 10 4 The operation oi": the mechanism is as follows: l i hen rocking the lever 10 in the direction of the arrow X shown in Fig. 3 the stop 1edepending from the right hand arm of the lever 10 rocks the adjacent lever 18, which therefore acts on the shoulder 19 ot the slide 5 and retracts the nose 6 out of engagementwith the rack Tand thus releases the carriage 29 from the bottom plate 26 ot the casing. Simultaneously the pawl 13 mounted on the letthandarm of the lever 10 is thrown into engagement with the rack 20. lVhon turther pressure is exerted on the hand piece 11 the carriage is shifted to the right. until the left-hand pawl 13 strikes against the left hand stop 15, whereupon further movement of the carriage is impossible. The distance between the stops 14- and 15 corresponds to the distance between two adjacent numeral wheels. li hen the lever 10 is released the parts are returned into initial position by the action of the spring 4 through the intermediary of the slide 5 and the levers 18 on the stops 1%, whereupon the spring 1 rocks the pawl 13 into the position shown in Fig. 3 in which it bears on the stop 14.

For shifting the carriage to the right or left distance corresponding to a plurality of orders of the numeral wheels the lever 10 is pushed inwardly by pressing on the finger piece 11 so that the stops 1 1 retract the slide 5 out of engagement with the rack til) 7 through. the intermediary of the levers l8, whereupon the carriage can be freely shifted any distance to the right or left.

In the .rnodification shown in Figs. & and the rack performs the-E function of the racks C and 20 of the ::ample shown in Figs. 1 to 3, by providing stops also for the nose (3 of the slide 5. The general arrangement of the mechanism is similar to the one described with reference to Figs. 1 to 3. However, the slide 5- .is reversed as compared to the slide 5, and the nose 6 at the front end of the slide and in position for engagement with the racl: .20 and the spring 4 tends to push the slide in forward direction. To the lever 10 two pins 21 are secured, which are in position to bear on levers mounted to rock on pins secured to the base plate 1' o the carriage.

For shifting the carriage one step to the right the finger piece ll is pressed to the rightand in the direction of the arrow 11 shown in Fig. 5. Thereby the pin 21 located at the right of the slide 5 acts on the slide 5 through the intermediary of the lever 22 so as to retract the nose 1 a ay from the rack 20. Simultaneously the left hand pawl 13 engages in the rack 20 and permits the carriage to be shifted one step in the manner described with reference to Figs. 1 to 3. \Vhen the finger piece 1D is released the parts are returned into the position shown in Fig. 5 by the spring l. If it is desired to shift the carriage a distance corresponding to several orders of the numeral wheels, the finger piece 11 is first pushed inwardly. Thereby both pins 21 act on the levers 22 and push the same against shoulders 31 of the slide 5 thus retracting the nose 6 away from the rack 20, whereupon the carriage is free to be shifted.

Preferably the dimensions of the levers 1S and 22 are such that a slightroeking or rectilinear movement of the lever 10 or 10 is suflicient to retractthe nose 6 or 6 out of engagement with the rack 7 or 20 lVhile in describing the invention reference has been made to particular examples embodying the same I wish it to be unden stood that my invention is not limited to the constructions shown in the drawings, and that various changes may be made in the general arrangement of the apparatus and the construction of its parts without departing from the invention.

I claim 1. In a calculating machine or the like embodying a casing and a carriage slidable in said casing, a latch for securing the carriage in adjusted positions in said casing, an operating member mounted on said carriage for sliding movement and also for rocking movement, means operable by either a sliding or rocking movement of said 0perating member to retract said latch, and

means associated. with said operating member and. engageaalo with said casi in the rocking movement of the ()PQH ting member to limit the advancing movement of said carriage.

2. In av calculating machine or the like embodying a casing and a carriage slidable in said casing, a latch normally securing said carriage against mm'ement, an operating member, means on the carriage on which said operating member is tlulcriuned for rocking and sliding movement and on which said latch is also slidable, means operable by either the rocking movement or the slid ing movement of said operating member for releasing said latch, and means associated with said operating member and caused by the rocking movement of said operating member to engage said casing and limit the advancing movement to said carriage.

3. In a calculating machine or the like embodying a casing and a carriage slidable in said casing, an operating member mounted on said carriage for sliding movement and also for rocking movement, a rack carried by said casing, a latch normally securing said carriage against movement in said casing, a pawl carried by said operating member and engageable with said rack when said operating member is rocked to limit advancing movement of said carriage, and a lever adapted, when rocked, to engage and retract said latch, said operating member when either rocked or given a sliding movement, engaging with and rocking said lever.

4. In a calculating machine or the like embodying a casing and a carriage slidable in said casing, an operating member having a slot, a pin mounted on said carriage and working in said slot to permit slid able movement of said operating member and on which said operating member may rock in opposite directions, a rack carried by said casing, a pair of pawls carried by said operating member, one of said pawls adapted to engage said rack when said operating membeer is rocked in one direction to limit advancing movement of said carriage in that direction and the other of said pawls adapted to engage said rack when said 0 crating member is rocked in the opposite .irection to limit advancing movement of said carriage in that direction, a latch normally securing said carriage against movement, and a pair of levers adapted, when rocked, to engage and retract said latch, said operating member, when rocked in either direction, engaging and rocking one of said levers and, when given a sliding movement, engaging and rocking both of said levers. I

5. In a calculating machine or the like, a casing, a carriage slidable in said casing, a T-shaped operating lever having a slot in its vertical arm, a pin mounted on said carriage and extending into said slot to permit sliding movement of said lever and on which said lever is fulerumed for rocking movement, a sliding latch for securing said carriage in adjusted positions in said casing, a pair of levers, one mounted. at each side of said latch and adapted when rocked to engage and retract said latch, a rack carried by said easing, a pawl mounted on each of the horizontal members of said shaped lever and adapted, respectively when said T-shaped lever is rocked in opposite directions, to engage said rack and limit ad vaneing moi'ement of said carriage, said T-shaped lever adapted, when rocked in one direction, to engage and rock one of said pair of levers and, when rocked in the opposite direction, to engage and rock the other of said pair 01" levers, said T-shaped lever, when given a sliding movement, engaging and rocking; both of said pair of levers.

in testimony whereof I have aiiixed my signature.

DR. ING. HERMANN HOFFMEISTER. 

